我的獨立看門狗總結(jié)
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(NVIC_InitStructure);
}
void Timer_init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
// ---------------------------------------------------------------
// TIM3 Configuration: 定時器3配置
// TIM3CLK = 36 MHz, Prescaler =36000, TIM3 counter clock = 1KHz
// SET TTIM3 TIME 200mS
//---------------------------------------------------------------
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
// Time base configuration
TIM_TimeBaseStructure.TIM_Period = 200;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Down;
TIM_TimeBaseInit(TIM3, TIM_TimeBaseStructure);
//Enables peripheral Preload register on ARR
TIM_ARRPreloadConfig(TIM3,ENABLE);
// Prescaler configuration
TIM_PrescalerConfig(TIM3, 35999, TIM_PSCReloadMode_Immediate);
TIM_InternalClockConfig(TIM3);
//Enables TIM interrupts
TIM_ITConfig(TIM3,TIM_FLAG_Update,ENABLE);
//TIM3 enable counter
TIM_Cmd(TIM3, ENABLE);
}
………………………………………………………………………
void TIM3_IRQHandler(void)
{
static u8 count=0;
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
//TIM3溢出中斷需執(zhí)行的代碼在此添加
count++;
if(count=25)
{
/* Enable write access to IWDG_PR and IWDG_RLR registers */
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
/* Reload IWDG counter */
IWDG_ReloadCounter();
}
}
}
四、結(jié)語
獨立看門狗時鐘由內(nèi)部40KHZ提供,所以不受主時鐘的影響,即一旦啟動看門狗,即便在調(diào)試過程中,暫停程序運行,看門狗也將不會停止,在復位時間到后仍會將系統(tǒng)復位。
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